let append1 string1 = string1 + ".append1"
let append2 string1 = string1 + ".append2"

let result1 = "abc" |> append1
printfn "\"abc\" |> append1 gives %A" result1

let result2 = "abc"
              |> append1
              |> append2
printfn "result2: %A" result2

[1; 2; 3]
|> List.map (fun elem -> elem * 100)
|> List.rev
|> List.iter (fun elem -> printf "%d " elem)
printfn ""